Some specs
The 3.9L/4B Cummins is an excellent high-torque, low-rpm engine in the same family as the 5.9L Cummins turbodiesels. The 3.9L/4B is an inline four-cylinder turbodiesel that was popular for many step van applications including bread vans and other commercial vehicles. This engine is also used in various industrial and construction applications. With a cylinder bore of 4.02 inches and a piston troke of 4.72 inches, the engine had a wet weight of 745 pounds. In recent years it produced 130hp and 355 lb-ft of torque.
B4.5
The B4.5S is a straight-4 version of the B Series used in agricultural environments. It produces 80–127 hp (60–95 kW). The B4.5 is structurally similar to the six-cylinder B6.7 with both sharing a 104 mm (4.1 in) bore and 132 mm (5.2 in) stroke.
B6.7
The B6.7S is the latest version of the B Series. It produces 350 hp (261 kW) and 650 ft·lbf (881 N·m) in the 2007.5 Dodge 2500/3500 pickup trucks and 305 hp (227 kW) and 610 ft·lbf (827 N·m) in the 2007 3500 Chassis Cab. The B6.7 is structurally similar to the four-cylinder B4.5 with both sharing a 104 mm (4.1 in) bore and 132 mm (5.2 in) stroke.
There are many changes over the previous B5.9 for the Dodge truck, the most obvious being the larger displacement. The new engine also includes a cooled EGR system, variable geometry turbocharger, and a new higher-pressure version of the Bosch direct-injection fuel system.
The Dodge trucks' B6.7 competes head to head with V8 engines offered by General Motors and Ford Motor Company, the Duramax and 6.4 L Power Stroke, respectively. All three engines have nearly identical power and torque output specifications and will be released within six months of each other. HTH
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